JavaScript Math Object
The Math object allows you to perform mathematical tasks.

View it Yourself  Examples 
round()
How to use round().
random()
How to use random() to return a random number between 0 and 1.
max()
How to use max() to return the number with the highest value of two specified numbers.
min()
How to use min() to return the number with the lowest value of two specified numbers.
Complete Math Object Reference
For a complete reference of all the properties and methods that can be used with
the Math object, go to our complete Math object reference.
The reference contains a brief description and examples of use for each property and method!
Math Object
The Math object allows you to perform mathematical tasks.
The Math object includes several mathematical constants and methods.
Syntax for using properties/methods of Math:
var pi_value=Math.PI;
var sqrt_value=Math.sqrt(16); 
Note: Math is not a constructor. All properties and methods of Math can be called by using Math as an object without creating it.
Mathematical Constants
JavaScript provides eight mathematical constants that can be accessed from the Math object. These are: E, PI, square root of 2, square root
of 1/2, natural log of 2, natural log of 10, base2 log of E, and base10 log of E.
You may reference these constants from your JavaScript like this:
Math.E
Math.PI
Math.SQRT2
Math.SQRT1_2
Math.LN2
Math.LN10
Math.LOG2E
Math.LOG10E 
Mathematical Methods
In addition to the mathematical constants that can be accessed from the Math object there are also several methods available.
The following example uses the round() method of the Math object to round a number to the nearest integer:
document.write(Math.round(4.7)); 
The code above will result in the following output:
The following example uses the random() method of the Math object to return a random number between 0 and 1:
document.write(Math.random()); 
The code above can result in the following output:
The following example uses the floor() and random() methods of the Math object to return a random number between 0 and 10:
document.write(Math.floor(Math.random()*11)); 
The code above can result in the following output:
